Although my version of a password seemed good in premise, I had forgotten that our can easily escape an Input( prompt with [2nd] [Mode]. I was going to repair this by replacing the input command with a getKey code checker and store-er, but, since andressevilla had already released a password checker after that model, I decided to leave it be and work on other projects.

If you want a password locker, I recommend his program more than mine (although I appreciate the reference from Mateo): Password Color

Depends. Do you want to lock up your program or the the calc? Because if its the calc, I'm sure there isn't any for that. As for locking programs you'll have to wait for Doors CE

I do have an assembly shell that locks programs for you (I am using Cesium. I was going to wait for Doors CSE, but I needed to do this before the end of the school year and Cesium works out great), I just need something that can passcode lock my actual calculator.

If you wanted to have a program run at startup, you'd have to insert it into the boot code, which from what I've heard, is not the easiest thing to do. KermMartian might have a way, though.

That's the same as modifying the OS, and we don't want to do that
You can use a hook to run a specific program whenever an even occurs (like, the cursor blinkers, the homescreen is active ect), and if I'm right, there is something like an ONSCRPT, but I'm not sure how that works, and if you can use it.

ONSCRT only runs after an auto power down or a warm start which is not very suitable in this case. Modifying the OS is preferred way of handling this; because it is a simple matter to uninstall the program if need be. Of course, some people prefer a combination of a raw key hook and OFFSCRPT; I personally do not like this method because someone can simply pull the batteries to get around it.

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